Peterson is reportedly suffering from withdrawal after taking himself off using the Schedule IV narcotic Clonazepam.

Canadian psychology professor Jordan Peterson has checked himself into a rehabilitation facility. Peterson checked himself in after experiencing withdrawal symptoms from his efforts to stop using the drug Clonazepam, according to his daughter Mikhaila Peterson.

Clonazepam is a brain and nerve calming drug used to treat panic attacks and prevent seizures. It is classified by the DEA as a Schedule IV narcotic.

Peterson was reportedly prescribed the drug after his wife Tammy was diagnosed with cancer in April. She has since recovered after numerous operations. According to Mikhaila Peterson, Tammy Peterson’s recovery has given Jordan Peterson a desire to take himself off Clonazepam.

Peterson has discussed his own bouts of depression with Joe Rogan and others. He has made several mentions of his recent public career “ending badly.”

“I’ve never seen my dad like this,” Mikhaila Peterson said. “He’s having a miserable time of it. It breaks my heart.”

Peterson’s self-help book 12 Rules For Life has sold over three million copies, and he has delayed the publication of a follow-up book.